| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 2001 |
|
The Violet Keystone | Perfection Learning | Novel | |
| December 2001 |
|
The Violet Keystone | Lucas Books / Scholastic | Novel | 1 |
| September 2002 |
|
Der violette Sonnenstein | Dino | Novel | |
| 2003 |
|
The Violet Keystone | Lucas Books / Scholastic | Novel | |
| 2003 |
|
A grande pedra violeta | Nova Fronteira | Novel | |
| 2003 |
|
Fialový kámen | Egmont CZ | Novel | |
| September 2003 |
|
The Seventh Tower Volumes 4-6 | Lucas Books / Scholastic | Omnibus | |
| April 2008 | The Violet Keystone | Paw Prints | Novel | ||
| May 2008 |
|
The Violet Keystone | Lucas Books / Scholastic | Novel | 1 |
| 2009 |
|
The Violet Keystone | Lucas Books / Scholastic | Novel | 1 |
| August 2010 |
|
The Violet Keystone | HarperCollins Children's Books | Novel | 7 |